JP2001056056A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To align lip lines of seal lips with each other by magnetically attracting opposite abutting split faces of an annular sealing device to each other to restrain dislocation of butt faces. SOLUTION: This sealing device is formed by a rubber magnet obtained by mixing magnetic particles in a rubber-like elastic body, and divided into a first part 2 and a second part in the circumferential direction. The split faces 2a, 2b and split faces 3a, 3b are respectively combined to abut on each other, and magnetized so that the split faces 2a, 3b are N-pole and the split faces 2b, 3a are S-pole to magnetically attract each other. Thus, the opposite split faces 2a, 2b and split faces 3a, 3b of the respective split parts 2, 3 of the sealing device 1 are magnetically attracted to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device divided into two parts, and to a joining technique of mating surfaces.

[0002]

2. Description of the Related Art Conventionally, a general annular oil seal (sealing device) having no cut portion has been assembled by inserting an oil seal into a shaft hole of a housing and then passing a shaft through the oil seal.
This is performed by inserting an oil seal into an annular gap between the shaft hole and the shaft after passing the shaft through the shaft hole of the housing.

However, for example, as shown in FIG. 5, when sealing water from a stern tube 102 of a ship into which a shaft 101 connecting screws is inserted, a grease box 103 is provided inside the stern tube 102. , Shaft 1
01 is inserted into the grease box 103 and is guided to the engine side (right side in the figure).

In such a case, it is difficult to install the annular oil seal as it is (the shaft must be divided), so that the gap between the stern tube and the grease box and the shaft is divided into two types. Oil seal 105
(105a, 105b: sealing device),
Without removing the shaft 101, the oil seal 11
0 is replaceable.

In recent years, a split type oil seal has not only a cross-sectional shape of a circle, a rectangle, and an ellipse but also an integral structure made of a rubber-like elastic body provided with a seal lip having an outer peripheral surface of a shaft as a sliding surface. The seal lip needs to be provided with an appropriate shrink allowance, and is in a compression deformed state in the shaft hole of the housing to which the seal lip is attached.

[0006]

However, in the conventional split-type oil seal, when it is necessary to mount the oil seal in an annular state by compression deformation into the shaft hole of the housing (if the oil seal is installed one by one, the oil seal will be installed later). The side to be compressed is greatly compressed and deformed, and mounting work becomes difficult). Therefore, it is not possible to hold the ring in a ring shape, and improvement in workability has been desired.

[0007] In addition, misalignment of the abutting surfaces is apt to occur, and it is difficult to make the lip lines of the respective seal lips coincide with each other.

An object of the present invention is to solve the above-mentioned problems of the prior art, and it is an object of the present invention to improve the mounting workability, suppress the displacement of the abutting surfaces, and make the lip lines of the seal lips coincide. It is an object of the present invention to provide a sealing device that enables the above.

[0009]

In order to achieve the above object, according to the present invention, at least two parts are divided in the circumferential direction.
In a sealing device having an annular shape, the divided surfaces are combined so as to oppose and contact each other, and a magnetic attraction means for magnetically adsorbing the opposing divided surfaces to each other is provided.

[0010] Thus, the workability of mounting the sealing device can be improved by magnetically attracting the divided surfaces of the divided sealing device that are in contact with each other.

That is, since the divided surfaces are magnetically attracted, 1
It can be handled in the same way as two annular sealing devices, and suppresses the drop of the lower part and the displacement of the dividing surface.

Further, the housing and the shaft to which the sealing device is attached are often made of iron or the like, so that the sealing device can be temporarily fixed to the housing, the shaft or the like, and the assembling work can be made more efficient. Can be.

It is also preferable to provide a fitting lip mounted on the shaft hole of the housing and a seal lip abutting on a sliding surface of the shaft.

This makes it possible to enhance the sealing performance. In addition, since the divided surfaces are magnetically attracted and positioned, deviation of the lip line of the seal lip can be prevented.

[0015] It is also preferable that the sealing device is formed of an elastic body capable of being magnetized, and is magnetized so that the opposing divided surfaces are magnetically attracted to each other.

[0016] The sealing device can be formed by integral molding with a so-called plastic magnet or rubber magnet, and a simple configuration can be achieved.

It is also preferable that an uneven fitting portion is formed on a divisional surface of the fitting portion that abuts and opposes.

By the concave and convex fitting portions, the positioning of the divided surfaces that are in contact with each other can be more reliably performed. The concavo-convex fitting portion may be a combination of a spherical bulge and a dent, but a pyramid or a truncated pyramid having a plurality of slopes may be applied to prevent twisting.

Further, the concave / convex fitting portion may adopt a form in which it is cut non-linearly from the side end surface or the outer peripheral surface of the sealing device. It is also possible to adopt a manufacturing method in which the sealing device formed in an annular shape is cut in the circumferential direction by cutting the sealing device, so that the manufacturing can be easily performed.

[0020] It is also preferable that the magnetic attraction means are concave and convex fitting members arranged at the fitting portion and magnetically attracting each other.

The provision of the concave-convex fitting members that magnetically attract each other enables the positioning and suction of the divided surfaces that face each other without changing the material of the main body of the sealing device.

[0022]

(Embodiment 1) FIG. 1 is a view for explaining a sealing device 1 according to a first embodiment.
FIG. 1A shows a state of being divided into two parts before mounting, and FIG.
FIG. 1 is an end view of the division surface (a view taken along the arrow V1-V1 in FIG. 1A), and FIG. 1C is a diagram showing a state where the division surfaces are joined to form an annular shape.

The sealing device 1 has a configuration in which a first part 2 and a second part 3 are circumferentially divided into two parts.
a, 2b and the dividing surfaces 3a, 3b are combined so as to face each other to form an annular shape as shown in FIG.
As shown in FIG. 1B, the shaft hole 1 of the housing 10 is formed.
It is mounted and used in an annular gap 12 between the outer peripheral sliding surface 11a of the shaft 11 inserted into the housing 10 and the shaft 10a.

As shown in FIG. 1 (b), the cross-sectional configuration of the sealing device 1 is a fitting portion 4 having a substantially rectangular cross section which fits into the shaft hole 10a of the outer periphery on the outer peripheral side. Seal lips 6a and 6b are formed to be inclined to both axial sides via a radial portion 5 extending to the inner peripheral side.

The sealing device 1 is formed by a rubber magnet in which magnetic particles are mixed in a so-called rubber-like elastic body, and the dividing surfaces 2a and 3b are N-poles.
The magnets b and 3a are magnetized so as to be magnetically attracted to each other so as to be S poles.

In the sealing device 1 configured as described above, 2
Each divided part of the divided sealing device 1 (first part 2, second part
Dividing surfaces 2a, 2b and dividing surface 3 which are opposed to each other in portion 3)
By magnetically attracting a and 3b to each other, the mounting workability of the sealing device 1 can be improved.

That is, since each divided surface is magnetically attracted,
The sealing device 1 can be handled in the same manner as a single annular sealing device, and a fall of a portion located on the lower side and a displacement between divided surfaces are suppressed.

The housing 10 and the shaft 11 to which the sealing device 1 is attached are often made of a magnetic material such as iron.
The housing 10 and the shaft 11 of the sealing device 1 are magnetically attracted.
It is possible to perform temporary fixing to the like, and the efficiency of the assembling work can be improved.

Further, since each of the divided surfaces is magnetically attracted and positioned, the seal lips 6a, 6
The displacement of the lip line b can be prevented.

The dividing plane is constituted by a plane (straight cut) orthogonal to the circumferential direction, but may be formed by an inclined plane (bias cut) or a wavy or step-like dividing plane (step cut). It is also possible.

In this embodiment, the sealing device 1 is divided into two parts, but it is also possible to divide the sealing device into two or more parts (for example, three parts). Also, it is possible to provide a magnetic attraction means for a divided surface with respect to a seal ring having a circular or rectangular cross section without a seal lip.

(Embodiment 2) FIG. 2 is a view for explaining a sealing device 21 according to a second embodiment. As a feature of this embodiment, an uneven fitting portion 27 is formed on the divided surface 22a and the divided surface 23a of the two divided portions 22 and 23 of the sealing device 21 that are opposed to each other. The other parts have the same configuration as the first embodiment.

The concave / convex fitting portion 27 is composed of a truncated quadrangular pyramid-shaped projection 22c protruding from the dividing surface 22a and a concave portion 23c formed in the dividing surface 23a in which the projection 22c is fitted. (Not shown) also has a similar configuration.

By the concave and convex fitting portion 27, in addition to the operation and effect of the first embodiment, the positioning of the divided surfaces that are opposed to each other can be more reliably performed. In particular, by further preventing the deviation of the lip lines of the seal lips 6a and 6b on each divided surface, the sealability can be further improved.

As the concave / convex fitting portion 27, a pyramid having a plurality of slopes or a truncated pyramid shape (a truncated pyramid in this embodiment) can be used to prevent twisting. A combination of depressions or a combination of a cylindrical shape and a circular concave portion may be used, and the shape is not limited.

Further, the concave-convex fitting portion 27 can be applied to an inclined surface, a wave-shaped or step-shaped divided surface.

(Embodiment 3) FIG. 3 is an explanatory sectional view of a sealing device 31 according to a third embodiment. The feature of this embodiment is that the divided surfaces 3 of the divided portions 32 and 33 of the sealing device 31 which are divided into two portions are in contact with each other.
A metal cup 38 made of a magnetic material, which is an uneven fitting member that magnetically attracts each other, and a magnetized stud 39 are embedded in the 2a and the dividing surface 33a.

When the metal cup 38 and the stud 39 are fitted together, they are magnetically attracted to each other and positioned reliably with respect to each other.

A hole 39 a is provided on the embedded side of the stud 39, and the hole 39 a is formed integrally with the divided portion 33.
The dough flows into the fabric, and a stronger bond is made.

By providing the concavo-convex fitting members that magnetically attract each other in this manner, the divided surfaces of the opposing and abutting divided surfaces can be changed without changing the material of the main body of the sealing device 31 (an ordinary rubber-like elastic body can be used). Positioning and suction can be performed.

(Embodiment 4) FIG. 4 is a view for explaining a form of a concave-convex fitting portion on a divided surface of a sealing device according to a fourth embodiment.

FIGS. 4 (a), (b), and (c) show the cut surfaces 41, 42 cut in the axial direction from a side end surface of the sealing device by a wavy, mountain-like, or trapezoidal non-linear cutter. , 4
3 is formed.

As described above, it is possible to adopt a manufacturing method of dividing the sealing device formed in an annular shape in the circumferential direction by cutting the sealing device, which can be manufactured more easily than a manufacturing method of manufacturing the divided surface by molding. Becomes

FIGS. 4D, 4E, and 4F show a method for further preventing the displacement of the lip line in the axial direction.
As shown in (1), it is also possible to form the divided surfaces 44, 45, and 46 by cutting the outer peripheral surface of the sealing device in the axial direction with a wavy, mountain-like, or trapezoidal non-linear cutter.

[0045]

As described above, according to the sealing device to which the present invention is applied, the workability of mounting the sealing device is improved by magnetically attracting the divided surfaces of the divided sealing device that are in opposition to each other. be able to.

That is, since the divided surfaces are magnetically attracted, 1
It can be handled in the same way as two annular sealing devices, and suppresses the drop of the lower part and the displacement of the dividing surface.

In many cases, the housing and the shaft to which the sealing device is attached are made of iron or the like, so that the sealing device can be temporarily fixed to the housing or the shaft, and the assembling work can be made more efficient.

By providing the seal lip, it is possible to enhance the sealing performance. In addition, since the divided surfaces are magnetically attracted and positioned, deviation of the lip line of the seal lip can be prevented.

The sealing device can be formed by integrally molding an elastic body with a so-called plastic magnet or rubber magnet, and has a simple structure.

Due to the concave and convex fitting portions of the divided surfaces which are in opposing contact,
Positioning of the opposing divided surfaces is more reliably performed.

By providing the concave and convex fitting members for magnetically attracting each other on the divided surfaces, it is possible to perform the positioning and the attraction between the opposing divided surfaces without changing the material of the body of the sealing device.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a sealing device according to a first embodiment.

FIG. 2 is an explanatory diagram of a main configuration of a sealing device according to a second embodiment.

FIG. 3 is an explanatory diagram of a main configuration of a sealing device according to a third embodiment.

FIG. 4 is an explanatory diagram of a main configuration of a sealing device according to a fourth embodiment.

FIG. 5 is a schematic diagram illustrating a situation in which a conventional sealing device is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing device 2 1st part 3 2nd part 2a, 2b, 3a, 3b Division surface 4 Fitting part 5 Radial part 6a, 6b Seal lip 10 Housing 10a Shaft hole 11 Axis 11a Outer sliding surface 12 Annular clearance

Claims (5)

[Claims] 1. A sealing device which is divided into at least two parts in a circumferential direction, and is combined so that respective divided surfaces are opposed to each other, and has an annular shape. The device has a magnetic attraction means for magnetically attracting the divided surfaces which are opposed to each other. A sealing device. 2. The sealing device according to claim 1, further comprising a seal lip that abuts a fitting portion mounted on the shaft hole of the housing and a sliding surface of the shaft. 3. The sealing device according to claim 1, wherein the sealing device is formed of an elastic body capable of being magnetized, and is magnetized so that the divided surfaces that come into contact with each other are magnetically attracted to each other.
Or the sealing device according to 2. 4. The sealing device according to claim 3, wherein a concave-convex fitting portion is formed on a divisional surface of the fitting portion that abuts and opposes. 5. The sealing device according to claim 1, wherein the magnetic attraction means is a concave / convex fitting member disposed at the fitting portion and magnetically attracting each other.